Harley Davidson Evolution Compression
If the engine doesnt detonate and cranks good I would be ok with those numbers.
Harley davidson evolution compression. Contrary to popular myth serious power can be made with stock Harley-Davidson heads without reshaping the combustion chambers polishing the ports and combustion chamber using a larger intake valves or making the ports larger. To download our Evolution Big Twin machining services catalog or our head work sheet click here. This head came off an 80 CID engine that produced 101 horsepower.
These 1051 forged pistons when used with Screamin Eagle 1340 Cylinder Heads are designed to produce high compression ratios for. Others that have owned EVOs may chime in. This what a stock EVOLUTION combustion chamber looks like with stock sized valves.
When the engine is assembled use one of the 030 inch thickness head gaskets instead of the normal 040 or 060 inch gaskets. Trending at C 38743. The 1100 Evolution engine has a predictably higher maximum HP of 50 at 5500 RPM with a top speed of 1019 MPH.
1340 FORGED PISTONS - 1051 010. High performance valve and valvetrain components for harley-davidson evolution. Air-cooled Evolution Displacement 883 cm3 Bore X Stroke 30x38 in OR 76 mm Compression Ratio 881 Horsepower 536000 KWhpRPM Torque 494100 lb-ftRPM OR.
Keith Black pistons kit dome top 951 compression standard bore for Harley Davidson Big Twin Evolution 80ci 1340cc. The engine isnt built full tilt. Automatic Compression Release ACR valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically.
You dont need to machine the heads as deep as if you were using OEM. However the heads have to come off and be drilled to install them unless theyre SS heads that are machined and plugged for them. Air-cooled Evolution Displacement 1200 cm3 Bore X Stroke 35x38 in OR 89 mm Compression Ratio 901 Horsepower 615500 KWhpRPM Torque 654000 lb.
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